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# Random data extract

Posted on 2003-03-27
Medium Priority
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I have a table of information with 4207 records with a couple of fields in MS Acces.. (These are the fields employee number,first name, last name and address).  I would like to create a query that will randomly display 25% of employee's the data. Can someone  help me with this?

I would greatly appreciate it.
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LVL 18

Expert Comment

ID: 8221530
first the easy part
to get a random value:

Dim rndbase As Integer
Dim rndvalue
rndbase = DCount("[employee number]", "employee table")
Randomize
rndvalue = Int((rndbase * Rnd) + 1)

this code get us a random value out of the total recordset
the question now is, what method you prefer to get 25% distinct values.

if you can add a check-field to your employee table
this would be a elegant possibility
in this case you can write a do..while loop on the sum of checked records reaching 25% of total records(= rndbase)
in the do-loop you set the checkfield in the recordnumber rndvalue to true

a filter on the checkfield gives you the randomly selected 25% of employee records

hope you can add this checkfield

regards, Franz
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LVL 6

Accepted Solution

TheAmigo earned 1000 total points
ID: 8221678
To write it as a query, try this:

SELECT TOP 1051 Employees.EmployeeID, Employees.Name
FROM Employees
ORDER BY Rnd([EmployeeID]);

that will also limit it to unique people.
0

LVL 41

Expert Comment

ID: 8221786
You can also use TOP 25 PERCENT rather than TOP 1051 :)
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LVL 6

Expert Comment

ID: 8222468
I'll have to remember that.  I found that TOP DCount("field","table")\4 doesn't work, but didn't know about PERCENT...
SQL isn't (yet) one of my strong points. :)
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LVL 18

Expert Comment

ID: 9240914
No comment has been added lately, so it's time to clean up this TA.
I will leave a recommendation in the Cleanup topic area that this question is:
Accept question, points to TheAmigo
Please leave any comments here within the next seven days.

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